Date   

Re: Comments from Peter Keller on the 500 Series Scopes

Dave Voorhis
 

On 23 Dec 2020, at 22:04, someone wrote:

"silver solder", ceramic terminal strips, any and all vacuum tubes... and lots of em, storage CRTs, just CRTs, kilowatt multi-tap power transformers, selenium rectifiers, thermal relay vacuum tubes, neon bulbs, multi-kilovolt flyback transformers, canned Al electrolytic capacitors, resin knobs...
The locals tell me Radio Trade Supply has be gone for 40 years... and my time machine is broken.
Well, yeah.

I love my 549 with 1A2, 1A4 and Type Z plugins. In terms of capabilities its arguably bested by even the 7623 — almost the same age — beside it, but as a working piece of electronics history, it's a marvel and a sheer delight to use in a way that more modern gear is not.


Re: Backlash/Play in the Delta Time Position Control on a 2236

 

Raymond,

Exactly right about which control I'm talking about, but I'm a bit confused about the service manual. I have the same PN for the service manual that you indicate, but I can't find R1618/1619, and the delta time position pot is labeled R1617, and indicates that it is only a single 2.2K pot. It sounds like we have the service manuals for each other's scopes (mine is a much later SN than yours, B027035). My SM appears to be the first printing from MAR 83.

-- Jeff Dutky


Re: Spectrum analyzer Tektronix 7L13 on mainframe Tektronix 7603

tinkera123
 

FYI .... I have a 7L13, TUNING functions as per dual clutch mechanism described above, TUNING dial max 1.878GHz, Build no: B 133,021.

Merry Xmas to all ...


--
Cheers,
Ian,
Melbourne, Australia


Re: Backlash/Play in the Delta Time Position Control on a 2236

 

On Wed, Dec 23, 2020 at 11:11 PM, Ed Breya wrote:


Jeff, if it works as is, I'd recommend leaving it alone - you can get used to
it. I don't know which of two controls is in question here - the one at the
top-center, or bottom-right. The B-delay in scopes was traditionally a
ten-turn pot, with a readout dial.
Ed,
Jeff is talking about the delta-time pot, not the B-delayed pot.
It's on dwg 10 "Counter Front End" in SM 070-4204-00, location K2. A single pot may be used but R1618 / R1619 may have to be changed.

Raymond


Re: Backlash/Play in the Delta Time Position Control on a 2236

Ed Breya
 

Jeff, if it works as is, I'd recommend leaving it alone - you can get used to it. I don't know which of two controls is in question here - the one at the top-center, or bottom-right. The B-delay in scopes was traditionally a ten-turn pot, with a readout dial. As I recall, it still is in 2200 models, except for a knob instead of the dial, to save cost (the dial can be more expensive than the pot). If you're talking about the upper one, then it's that skinny trimmer-like one, on the middle of the top board, driven by the long extension shaft. I don't know if it's supposed to be a multi-turn type or not, but your description seems to indicate it's a single turn. If you really want to avoid using a lash pot, you may be able to find a ten-turn mini-sized pot of the same style and fit, and have good resolution (but slower to reach the spot). If the pot in Raymond's 2236 is 10-turn (or even 3 or 5), then that may be the way to go. If you can't get something with more resolution, the lash pot is a decent compromise. If you use the function a lot, you may find it frustrating to set the value right, without higher resolution or coarse/fine control.

If the one in question is the B-delay, then it's easy to replace with a standard ten-turn helipot, and you can even add a dial, if needed.

Ed


Re: Comments from Peter Keller on the 500 Series Scopes

Roy Thistle
 

On Wed, Dec 23, 2020 at 01:12 PM, Randy Newman wrote:


since it
didn't use many specialized parts.
"silver solder", ceramic terminal strips, any and all vacuum tubes... and lots of em, storage CRTs, just CRTs, kilowatt multi-tap power transformers, selenium rectifiers, thermal relay vacuum tubes, neon bulbs, multi-kilovolt flyback transformers, canned Al electrolytic capacitors, resin knobs...
The locals tell me Radio Trade Supply has be gone for 40 years... and my time machine is broken.


Re: Comments from Peter Keller on the 500 Series Scopes

Gordon Smith
 

If anyone is looking for a 547 in the Reno, NV area, there is one on Craigslist with 1A4 plug in and probe. The current owner claims that it works and has pictures. Other than a hacked fan install, looks legit. Link is here: https://reno.craigslist.org/for/d/genoa-1969-tektronix-547-with-1a4/7235767411.html

No financial interest/connection, just passing along. If I was closer, I'd seriously consider it just for the plugin and probe.

Thank You, Gordon


Re: Help with 2712 Spectrum Analiser

Jean-Paul
 

Of course check power supply voltages first and use debugging flowcharts in manual

j


Re: Help with 2712 Spectrum Analiser

Jean-Paul
 

Marcus,

1/ get service manual for your serial numbers, Tekwiki, BAMA archive, for free pdf, or Artech, Qservice for pdf, cd or printed version, perhaps 10-50$

2/ open unit, find and replace battery, inspect for leaking SMD lytics, bad PSU caps, shorted tants, overheating parts

3/ input mixers are susceptible to overloading, symptoms no response only noise.

Bon Chance

Jon


Re: Backlash/Play in the Delta Time Position Control on a 2236

 

On Wed, Dec 23, 2020 at 10:10 PM, Jeff Dutky wrote:


Okay, I broke out the multimeter and I can see what's happening, but I'm not
sure I understand how to use this:

The forward block (10K) changes value during both the "loose" (45 degree) and
the "stiff" (remaining 300 degree) spans of motion. The stiff range can take
the pot through its entire 10K range, but the loose range only covers about 2K
change in resistance.

The rearward block (2K) only changes value during the "stiff" span (the other
300-odd degrees).

So this was someone's idea of how to give both a coarse and fine adjustment
with only a single knob? And they didn't think to mention this in the
operators manual?

I'd be interested to know the part number for the delta time position pot in
your 2236, so I could order one that doesn't have this "feature". My pot is
part #311-1638-01. Is yours a 2236A by any chance?
Jeff,
According to my SM (070-4204-00), the pot is A10R1617.
In S/N B010100 - B010999, it's a 311-2176-00, 2k2
In S/N B011000 - B014069, it's a 311-1625-01, 1 k
In S/N B014070 - B015819, it's a 311-1638-00, 2k front / 10 k rear
In S/N B015820 and up, it's a 311-1638-01, 2k rear, 10 k front

So there you have it!

Raymond


Re: Comments from Peter Keller on the 500 Series Scopes

Roy Thistle
 

Hi All:
I always thought the 500 fan club were "triple nickle" nuts... and would trade their grandma for a 585. You know: the 555 pushing 50 Kg (more with the cart) and blowing out 1200W (virtually all heat, for the cold winter days in the garage.)... what's not to love?
I know where there are two 555s... one guy doesn't even know it needs a power supply. The other... like many of these 500s still left relatively un-violated is using it to hold down the basement floor, and for propping up one corner of the laundry tub.
Lately, there's been some "talk" about 547s, frames, and plug-ins. Watch the prices rise... and if Dave Jones gets a hold of one... watch the prices sky rocket.


Re: Tektronix 317

Larry McDavid
 

With the several etched numbers reported, I wonder if there were variations of this Evaluation Board meant for different Tek scopes. Does anyone know?

Larry

On 12/22/2020 10:37 PM, Jeff Woolsey wrote:
I, too, have one.  Mine's marked @T-1 309 just under the edge of the
battery holder. G-1432-XA under it.
I bought it for my 2440, the scope on the cover of the manual.
On 12/22/20 8:52 PM, Larry McDavid wrote:
I have one of these Scope Evaluation Boards. Mine is marked, "T-1419,"
not T-1449; maybe just a typo.

Yes, one side is essentially 90% 9-volt battery holder.

I did not have the extensive instruction manual, however. Thanks for
that, Bob.

Larry


On 12/22/2020 12:38 PM, Bob Albert via groups.io wrote:
  It's called a scope evaluation board and is about 30 years old.
Most of it is a battery holder.  There is a number T-1449 on it and
has 3 ICs.
Bob
     On Tuesday, December 22, 2020, 12:21:48 PM PST,
<brockkoren@gmail.com> wrote:
    oh they won't allow that email, maybe bkoren@gamma-sci.com
--
Best wishes,

Larry McDavid W6FUB
Anaheim, California (SE of Los Angeles, near Disneyland)


Re: Comments from Peter Keller on the 500 Series Scopes

TomC
 

On 12/23/2020 12:39 PM, Timothy W. Koeth wrote:
For example, the
header photograph of this page of my basement measurement of the muon
lifetime starts of with the 555 P-11 phosphor image of the "capture and
death" signature of a muon:
http://www.nuclearphysicslab.com/npl/npl-home/experiments/muons/muon-lifetime-measurment/
An unreasonable amount of time was put into setting up the timing just to
display this on the 555 - but it was worth it!
Tim, that's a great photo. Especially striking with the blue phosphor and red graticule.

Tom


Re: Backlash/Play in the Delta Time Position Control on a 2236

 

Ed,

Yes, I tried using in the delta time mode, and it works as you describe. It takes a little getting used to, and it has no effect in other modes (which use the second block of the POT, I guess). I see how it is useful, but it's a bit distracting. I would have preferred a second knob for fine control, like they did with the stacked intensity knobs.

-- Jeff Dutky


Re: Comments from Peter Keller on the 500 Series Scopes

Randy Newman
 

Hi Dennis.
I’d be glad to pass on to Peter my thoughts about 500 series scopes. I have
a nearly pristine 555 on a Tek scope cart, and have a few plugins ( CA (2),
D, W, and a 1A7 I purchased from Stan Griffiths a few years back.). Mine
has the bluish phosphor for high speed photography, and a very sharp trace.
I’ve used a fair number of Tek scopes during my career, from 565’s early on
as a wee engineer, to 7000 series, 11000 series, and some of the recent 8
GHz DSA series. I still love my 555. I also own 3 other 7k scopes, which
are very nice, but certainly do not Have the classic-factor of the 555. I
share the sentiment of the late Jim Williams, who stated that the Tek
scopes of the 500 series era were designed in a unique period of time which
drove their development, and which will not agin occur.

Randy

On Wed, Dec 23, 2020 at 11:47 AM Dennis Tillman W7pF <dennis@ridesoft.com>
wrote:

Since Sunday when I picked up 106 of Peter Keller's books we have spoken by
phone. During our conversation Peter mentioned a few things I thought I
should pass along since I thought he may have reached the wrong conclusion
from his brief time as a member of TekScopes.

Peter was disappointed that there didn't seem to be much interest in the
500
series of oscilloscopes. I thought it might be nice if Peter heard from how
many TekScopes members have 500 series scopes and what you like most about
your favorite model.

* Peter and I both agree that the pinnacle of the 500 series was the 547. I
was in love with the first one I got to use in 1967 shortly after it was
introduced. That was a fabulous scope!
* We both agree the 500 series was known worldwide for the incredibly tiny
CRT spot size.
* Peter felt the 500 series was the last scope anyone could fix since it
didn't use many specialized parts. I disagree about this because I have
spent years troubleshooting and repairing 7000 series plugins and
mainframes. Tektronix' fabulous documentation makes it just as easy to fix
these 7000 scopes as it does to fix the 500 series but that it just my
opinion.

From the volume of posts we receive it may appear that there is more
interest in the some of the portables but that is because they are so often
broken, replacement parts are impossible to find, they use a lot of surface
mount and custom parts, and Tek stopped providing Circuit Descriptions,
Parts Lists, and schematics to assist in calibrating and repairing them.

Dennis Tillman W7pF






Re: Remove adhesive from old Tek aluminium cabinet covers

WB4IUY
 

I just restored an old 564B and it had lots of adhesive / stickers on it.
Alcohol and scrubbing bubbles seemed to work pretty good.

Dave WB4IUY


Re: Backlash/Play in the Delta Time Position Control on a 2236

 

Raymond,

Okay, I broke out the multimeter and I can see what's happening, but I'm not sure I understand how to use this:

The forward block (10K) changes value during both the "loose" (45 degree) and the "stiff" (remaining 300 degree) spans of motion. The stiff range can take the pot through its entire 10K range, but the loose range only covers about 2K change in resistance.

The rearward block (2K) only changes value during the "stiff" span (the other 300-odd degrees).

So this was someone's idea of how to give both a coarse and fine adjustment with only a single knob? And they didn't think to mention this in the operators manual?

I'd be interested to know the part number for the delta time position pot in your 2236, so I could order one that doesn't have this "feature". My pot is part #311-1638-01. Is yours a 2236A by any chance?

-- Jeff Dutky


Help with 2712 Spectrum Analiser

Marcus - PP5MS
 

Hello!

My name is Marcus and I am from Brazil.
.
I just received a Tektronix 2712 that I wanted for a long time. I bought it at a local auction and I already expected it to have some problem.
Visually it's very good, so I turned on the power to see how it works.
I was very happy to see the apparently normal screen.
However, I noticed some problems.
I set the clock / calendar that was totally wrong as expected, but by turning the power off and on, the settings are lost.
I already read on the internet that there is a battery to be replaced, which I intend to do soon.
But unfortunately there are more problems.
Although the scan line appears on the screen, even with the characteristic noise of spectrum analyzers, it does not show any signal.
I turned on the 100MHz calibrator. and it doesn't appear either.
The frequency meter does not show any reading and the following messages appear on the screen on the left, below the configured parameters, that is, in the fourth and fifth line:

UNCAL
CANNOT COUNT (VCO, IF)

In the "FREQUENCY COUNTER TEST" screen I have the following information:

0 VCO, LOCKED
1 BEAT, LOCKED
2 VCO, NOT LOCKED
3 BEAT, NOT LOCKED

Could someone point me on the right direction to look for the problem?
Any help will be very welcome, I wanted to put my Christmas gift to work ...!

I wish a Merry Christmas to everyone !!

Marcus - PP5MS


Re: Remove adhesive from old Tek aluminium cabinet covers

 

Try alcohol or WD-40
HankCBoston


Re: Comments from Peter Keller on the 500 Series Scopes

Paul Amaranth
 

I have a 555 that followed me home just because it's an
iconic scope and I couldn't bear the thought of it going
for scrap or the tube harvesters.

I'll get to it one of these winters (at 1KW it's a little
much for working on in the summers).

I think nobody talks about them much since repair is pretty
straightforward; there's no esoteric technology that you
have to work around. All you need is some 2-3% silver solder
and you're good to go.

Paul

--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@AuroraGrp.Com | Unix/Linux - We don't do windows

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